docs(extraction): fix remaining NVBugs 6179241 links for 26.3.0

[kheiss-uwzoo]

Summary

• Fix image_viewer.py link in quickstart-guide.md to point at NVIDIA/NeMo-Retriever on the 26.03 branch instead of the renamed nv-ingest repo.
• Fix Riva support matrix URL in audio.md to use the current /docs/public/support-matrix/ path.
• Fix default_pipeline.yaml link in user-defined-functions.md to the raw 26.03 config on NeMo-Retriever.

Closes remaining NVBugs 6179241 source edits for the 26.3.0 doc train after #2048. Republish 26.3.0 after merge to clear the crawler.

Test plan

• Verify the three updated URLs resolve in a browser.
• Docs build succeeds for touched extraction pages.
• After republish, re-run the broken-link scan for /nemo/retriever/26.3.0/extraction/.

[greptile-apps]

Greptile Summary

This PR fixes three broken documentation links across the extraction docs to resolve the remaining NVBugs 6179241 items for the 26.3.0 release. All changes are documentation-only (no code modifications).

• audio.md: Adds the missing /public/ path segment to the Riva support matrix URL.
• quickstart-guide.md: Retargets the image_viewer.py link from the old NVIDIA/nv-ingest repo to NVIDIA/NeMo-Retriever on the 26.03 branch.
• user-defined-functions.md: Retargets the default_pipeline.yaml link from the old NVIDIA/nv-ingest repo to NVIDIA/NeMo-Retriever on the 26.03 branch, using the standard blob/ GitHub URL form.

Confidence Score: 5/5

Documentation-only link fixes with no code changes; safe to merge once URLs are manually verified in a browser.

All three changes are single-line URL replacements in Markdown files. The old links pointed at the archived nv-ingest repo or a stale Riva docs path; the new links target the correct NVIDIA/NeMo-Retriever 26.03 branch and the updated NVIDIA docs path. No logic, configuration, or runtime behavior is affected.

No files require special attention; the test plan's manual URL verification step is the only meaningful gate before merging.

Important Files Changed

Filename	Overview
docs/docs/extraction/audio.md	Updates the Riva support matrix URL to include the /public/ path segment, fixing a broken link.
docs/docs/extraction/quickstart-guide.md	Redirects the image_viewer.py link from the archived nv-ingest repo to NVIDIA/NeMo-Retriever on the 26.03 branch.
docs/docs/extraction/user-defined-functions.md	Updates the default_pipeline.yaml link from the archived nv-ingest repo to NVIDIA/NeMo-Retriever on the 26.03 branch using the standard blob/ GitHub URL form.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Broken links in 26.3.0 docs] --> B[audio.md]
    A --> C[quickstart-guide.md]
    A --> D[user-defined-functions.md]

    B -->|Was| B1["docs.nvidia.com/.../support-matrix/support-matrix.html"]
    B -->|Now| B2["docs.nvidia.com/.../public/support-matrix/support-matrix.html"]

    C -->|Was| C1["github.com/NVIDIA/nv-ingest/blob/main/src/util/image_viewer.py"]
    C -->|Now| C2["github.com/NVIDIA/NeMo-Retriever/blob/26.03/src/util/image_viewer.py"]

    D -->|Was| D1["github.com/NVIDIA/nv-ingest/blob/main/config/default_pipeline.yaml"]
    D -->|Now| D2["github.com/NVIDIA/NeMo-Retriever/blob/26.03/config/default_pipeline.yaml"]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[Broken links in 26.3.0 docs] --> B[audio.md]
    A --> C[quickstart-guide.md]
    A --> D[user-defined-functions.md]

    B -->|Was| B1["docs.nvidia.com/.../support-matrix/support-matrix.html"]
    B -->|Now| B2["docs.nvidia.com/.../public/support-matrix/support-matrix.html"]

    C -->|Was| C1["github.com/NVIDIA/nv-ingest/blob/main/src/util/image_viewer.py"]
    C -->|Now| C2["github.com/NVIDIA/NeMo-Retriever/blob/26.03/src/util/image_viewer.py"]

    D -->|Was| D1["github.com/NVIDIA/nv-ingest/blob/main/config/default_pipeline.yaml"]
    D -->|Now| D2["github.com/NVIDIA/NeMo-Retriever/blob/26.03/config/default_pipeline.yaml"]

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